Special Weather Statement, NWS North Platte, NE

Area Forecast Discussion...UPDATED
National Weather Service North Platte NE
642 PM CDT Sun Jun 30 2019

.SHORT TERM...(This evening through Monday night)
Issued at 234 PM CDT Sun Jun 30 2019

Upper level ridging is in the process of flattening and settling
back over the Southern Plains. This has allowed a stationary front
that has been located across South Dakota to sink south into
northern Nebraska. The front will continue to slowly sink south and
be located from around O'Neill to North Platte to Imperial by Monday
afternoon. This front will be the focus for thunderstorm development
tonight through Monday night.

Thunderstorms are developing this afternoon in a moist/unstable
upslope environment across northeast Wyoming. Several of the CAMs
have this development depicted correctly, and grow this activity
upscale into a forward propagating MCS across southern South Dakota
and perhaps far northern Nebraska. Other isolated storms could
develop late this afternoon near the stationary front located across
Cherry and Sheridan counties. Overall the shear is weak...but
effective shear does increase to near 30 kts to the north of the
stationary front across far northern Nebraska due to backed easterly
low-level flow. This could allow for some stronger storms to evolve
near the SD/NE border region late this afternoon and evening.
Farther south the mid-level flow is very weak (about 10 kts on
morning LBF sounding). In addition mid-level temperatures are quite
warm, and thunderstorm chances tonight quickly fade farther to the
south towards I-80.

Front will sag farther south tomorrow. It's location could be
impacted by any southward moving outflow from tonight's storms
across SD. So just where the front will be located is uncertain.
Thought is the front will extend from near O'Neill to North Platte
to Imperial by afternoon. Did increase storm chances to about 50
percent within this corridor during the late afternoon hours, but
steered clear of likely pops due to the uncertainties. A good
thermodynamic environment will exist in this area but shear is weak.
High moisture levels could lead to some locally heavy rainfall in
places Monday evening, especially if storms tend to train/develop
across the same areas along and just north of the front. This seems
possible as a southerly low level jet develops Monday evening and
noses into the frontal zone. Otherwise not as hot Monday, with highs
ranging from near 80F near the SD/NE border to 90F near and just
ahead of the front across central into southwest Nebraska.

.LONG TERM...(Tuesday through Sunday)
Issued at 234 PM CDT Sun Jun 30 2019

Upper level ridging will remain across the Southern Plains through
the upcoming week. It is forecasted to build northward some Tuesday
into Wednesday, with the stationary front lifting back north into
South Dakota. This could shift the higher thunderstorm chances
northward into SD mid-week with highs approaching 90F once again.

Late in the week and next weekend, it appears a leeward surface
low will become established across northeast CO with moist
southeast upslope flow across the region. Mid-level flow remains
fairly weak, but at least scattered thunderstorms are possible
across the region on the northern periphery of Southern Plains
upper level ridging. Highs look to mostly be in the 80s for the
upcoming Holiday weekend.

&&

.AVIATION...(For the 00Z TAFS through 00Z Monday evening)
Issued at 642 PM CDT Sun Jun 30 2019

Scattered thunderstorms are likely this evening between Lewellen,
Mullen, Ainsworth and Springview. Storm activity is expected to
weaken 03z-04z and dissipate 07z-09z. Another area of MVFR/IFR
ceilings is expected to form across northern Nebraska 09z-12z,
along and north of highway 20. VFR is generally expected by 18z
Monday.

&&

.LBF WATCHES/WARNINGS/ADVISORIES...
Heat Advisory until 8 PM CDT this evening for NEZ007-009-010-
026>029-037-038-059-071.

&&

SHORT TERM...Taylor
LONG TERM...Taylor
AVIATION...CDC

Hazardous Weather Outlook
National Weather Service North Platte NE
317 PM CDT Sun Jun 30 2019

NEZ004>010-022>029-035>038-056>059-069>071-094-012030-
Sheridan-Eastern Cherry-Keya Paha-Boyd-Brown-Rock-Holt-Garden-
Grant-Hooker-Thomas-Blaine-Loup-Garfield-Wheeler-Arthur-McPherson-
Logan-Custer-Deuel-Keith-Perkins-Lincoln-Chase-Hayes-Frontier-
Western Cherry-
317 PM CDT Sun Jun 30 2019 /217 PM MDT Sun Jun 30 2019/

This Hazardous Weather Outlook is for portions of western and
north central Nebraska.

.DAY ONE...TONIGHT.

Dangerous heat and humidity will continue through mid evening
roughly east of a line from North Platte to Naper where heat
indices may reach 100 to 105 degrees.

Thunderstorm chances will increase this evening across a large
portion of western and north central Nebraska, generally north of
a line from Ogallala, to Thedford, to Butte. A slight risk of
severe thunderstorms exists north of a line from Alliance to
Springview. Large hail and damaging winds are the main threats.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.

Another round of thunderstorms is possible on Monday with most of
western and north central Nebraska being in a marginal risk for
severe storms. The exception is Wheeler and southeastern Holt
county where a slight risk exists.

Thunderstorm chances continue for the remainder of the week with
the main threat during the late afternoon and evening hours.
Severe weather risk is uncertain at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed through tonight.

&&

Get your weather, hydrological, and climate information at
http://www.weather.gov/northplatte

CLB

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Special Weather Statement
National Weather Service North Platte NE
635 PM CDT Sun Jun 30 2019

NEZ005-006-008-010030-
Brown NE-Eastern Cherry NE-Keya Paha NE-
635 PM CDT Sun Jun 30 2019

...SPECIAL WEATHER STATEMENT...

At 635 PM CDT, Doppler radar was tracking a strong thunderstorm 11
miles west of Johnstown, or 21 miles west of Ainsworth, moving
northeast at 10 mph.

Half inch hail and winds in excess of 30 mph will be possible with
this storm.

Locations impacted include...
Johnstown, Wood Lake, Smith Falls State Park, Bobcat State Wildlife
Management Area, Meadville, North River Trail and Sparks.

This includes the following highways...
 Highway 20 between mile markers 205 and 231.
 Highway 12 between mile markers 10 and 17, and between mile markers
25 and 28.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in North Platte.

&&

A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
north central Nebraska.

LAT...LON 4247 10019 4262 10053 4299 10040 4276 9982
TIME...MOT...LOC 2335Z 217DEG 9KT 4258 10028

Jurgensen/CDC

Special Weather Statement
National Weather Service North Platte NE
547 PM MDT Sun Jun 30 2019

NEZ004-023-094-010030-
Sheridan NE-Grant NE-Western Cherry NE-
547 PM MDT Sun Jun 30 2019

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN CHERRY...
NORTHWESTERN GRANT AND SOUTHEASTERN SHERIDAN COUNTIES UNTIL 630 PM
MDT...

At 546 PM MDT, Doppler radar was tracking a strong thunderstorm near
Ashby, or 34 miles north of Arthur, moving northeast at 10 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Hyannis, Ashby, Whitman Road crossing the North Branch of the Middle
Loup River, Bingham and Mother Lake.

This includes the following highways...
 Highway 2 between mile markers 131 and 150.
 Highway 61 between mile markers 156 and 180.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in North Platte.

&&

A Severe Thunderstorm Watch remains in effect until 1000 PM MDT for
north central and west central Nebraska.

LAT...LON 4186 10185 4204 10210 4235 10180 4217 10149
TIME...MOT...LOC 2346Z 217DEG 9KT 4206 10184

Jurgensen/CDC

Special Weather Statement
National Weather Service North Platte NE
704 PM CDT Sun Jun 30 2019

NEZ005-010030-
Eastern Cherry NE-
704 PM CDT Sun Jun 30 2019

...SPECIAL WEATHER STATEMENT...

At 704 PM CDT, Doppler radar was tracking a strong thunderstorm near
Valentine National Wildlife Refuge, or 20 miles south of Valentine,
moving northeast at 20 mph.

Half inch hail and winds in excess of 30 mph will be possible with
this storm.

Locations impacted include...
Big Alkali Lake State Wildlife Management Area.

This includes the following highways...
 Highway 20 between mile markers 200 and 205.
 Highway 83 between mile markers 187 and 207.
 Highway 12 between mile markers 3 and 5.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in North Platte.

&&

A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
north central Nebraska.

LAT...LON 4248 10048 4259 10069 4292 10048 4289 10041
      4263 10051 4256 10036
TIME...MOT...LOC 0004Z 224DEG 19KT 4258 10055

Jurgensen/CDC